Storage from official US gauges (USGS, USACE, Bureau of Reclamation, CDEC). Fill % uses design capacity from the National Inventory of Dams where available; a few sites without a match fall back to the 5-year maximum.

About reservoirs in Arizona

As of July 29, 2026, the reservoirs we track across Arizona that report live levels hold roughly 5,162 hm³ of water — about 83.9% of their combined capacity. Taken together, Arizona's reservoirs are high.

Across the region, 1 reservoir is at critically low levels and 1 is low. LAKE MOHAVE AT DAVIS DAM, AZ-NV is the fullest at 105.0%, while SAN CARLOS RESERVOIR AT COOLIDGE DAM, AZ is the lowest at 0.0%.

Storage figures for Arizona come from USGS · USACE · BOR · CDEC; the most recent reading is from July 29, 2026. Each reservoir below links to its own page with full history and seasonal context.

Arizona at a glance

Reservoirs tracked: 7
Average fill: 83.9%
Water stored: 5,162 hm³
Combined capacity: 6,151 hm³
At critically low levels: 1
Fullest: LAKE MOHAVE AT DAVIS DAM, AZ-NV (105.0%)
Lowest: SAN CARLOS RESERVOIR AT COOLIDGE DAM, AZ (0.0%)
Last updated: July 29, 2026

Frequently asked questions

How full are reservoirs in Arizona right now?

As of July 29, 2026, the reservoirs tracked in Arizona that report live levels are 83.9% full overall, holding about 5,162 hm³ of water.

How many reservoirs are there in Arizona?

reservoirs.earth tracks 7 reservoirs in Arizona, with a combined storage capacity of 6,151 hm³.

Which reservoir in Arizona is the fullest?

LAKE MOHAVE AT DAVIS DAM, AZ-NV is currently the fullest reservoir in Arizona, at 105.0% of capacity.

Which reservoir in Arizona is the lowest?

SAN CARLOS RESERVOIR AT COOLIDGE DAM, AZ is currently the lowest in Arizona, at 0.0% of capacity.

Where does the reservoir data for Arizona come from?

All storage figures for Arizona come from USGS · USACE · BOR · CDEC, an official source, last updated July 29, 2026.

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